exam Maths Puzzle Numerical Ability

Apply using quadratic formula to find the roots and graph.
g(x)= x^2 - x - 12

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i KNOW THAT THIS IS PROBABLY A SIMPLY ONE BUT iM HAVING A TIME TRYING TO FIGURE HOW TO GET THE CORRECT ANSWER. DMVT math student.

SOLVE FOR B: AX+BY=C. how do you get an answer from this? Points X,Y and Z are collinear, with point X between points Y and Z. If XY =14.8 and YZ= 18.2, find XZ????